Correct Answer : Both (a) and (b)
Explanation : The finish() method is used to close the activity. Whereas the finishActivity(int requestCode) also closes the activity with requestCode.
Correct Answer : Fragments
Explanation : In android mini-activities are also known as Fragments
Correct Answer : startActivityForResult()
Explanation : startActivityForResult() should use when need to pass data back from an activity.
Correct Answer : onCreate() callback
Explanation : Android system initiates its program with in an Activity starting with a call on onCreate() callback method..